AP Diving Inspiration Vision Rebreather Coaxial Sensor Back Cover

thingiverse

When using a 4 or 5 cell holder like [this one](https://www.tecme.de/Inspistuff.htm) on an [AP Diving Inspiration Vision](https://www.apdiving.com/en/rebreathers/which-ccr/) rebreather, the coaxial cables to connect to the sensors used for external monitoring often come without a back cover to fit onto the back of the cell. I designed this cover with dimensions matching the original (blue) cell cover that is installed by AP Diving on the original sensor connectors. I experimented with versions in PETG and TPU. The TPU version is a nicer fit, and easier to install, but in the end I went for PETG, because it is food safe and does not degrade with exposure to moisture. The overhangs are designed to make it printable without supports if printed with the side towards the sensor up. **Important:** This cover is only intended to stop condensation drops from entering the back of the sensor, not to seal it off. As the air space at the back of the sensor needs to be able to equalise to the ambient pressure, **do not** glue this cover on, or make it air tight in any other way. **Update:** After some discussion about the importance of the back of the cell being sufficiently ventilated, I have added a version that has an air vent on the side of the SMB connector. Please use this if you are printing in soft material, or if you are worried about not having sufficient ventilation. From Martin Parker / AP Diving: > To check whether there is sufficient gas transfer, take the lid to 1.35 - 1.4 bar using a cell validator then release the gas quickly from the lid while watching the PO2 display. >If you leave one cell open and the other cells with your new covers you’ll soon see the difference, if there is any. If there is a difference in reaction to the pressure drop you will need to have bigger air channels.